Financing Receivables: (Details 5) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 21,494	$ 22,510
Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	15,670	16,701
Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	5,824	5,808
Lease receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,826	9,174
Lease receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	6,776	7,036
Lease receivables | Major Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	577	646
Lease receivables | Major Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,559	1,664
Lease receivables | Major Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,398	2,285
Lease receivables | Major Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,231	1,367
Lease receivables | Major Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	542	552
Lease receivables | Major Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	381	399
Lease receivables | Major Markets | CCC+ - D-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	89	124
Lease receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,049	2,138
Lease receivables | Growth Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	90	86
Lease receivables | Growth Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	205	223
Lease receivables | Growth Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	818	776
Lease receivables | Growth Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	309	450
Lease receivables | Growth Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	405	418
Lease receivables | Growth Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	163	127
Lease receivables | Growth Markets | CCC+ - D-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	60	58
Loan receivables
Gross recorded investment for each class of receivables, by credit quality indicator
Total	12,668	13,336
Loan receivables | Major Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	8,894	9,666
Loan receivables | Major Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	757	887
Loan receivables | Major Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	2,046	2,286
Loan receivables | Major Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	3,147	3,139
Loan receivables | Major Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,616	1,878
Loan receivables | Major Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	711	758
Loan receivables | Major Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	500	548
Loan receivables | Major Markets | CCC+ - D-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	117	170
Loan receivables | Growth Markets
Gross recorded investment for each class of receivables, by credit quality indicator
Total	3,774	3,670
Loan receivables | Growth Markets | AAA - AA-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	165	148
Loan receivables | Growth Markets | A+ - A-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	378	382
Loan receivables | Growth Markets | BBB+ - BBB-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	1,506	1,333
Loan receivables | Growth Markets | BB+ - BB
Gross recorded investment for each class of receivables, by credit quality indicator
Total	568	773
Loan receivables | Growth Markets | BB- - B+
Gross recorded investment for each class of receivables, by credit quality indicator
Total	746	718
Loan receivables | Growth Markets | B - B-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	300	218
Loan receivables | Growth Markets | CCC+ - D-
Gross recorded investment for each class of receivables, by credit quality indicator
Total	$ 110	$ 99